LeírásImage from page 230 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14804894213).jpg |
Identifier: introductiontozo00dave
Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools;
Year: 1900 (1900s)
Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866-
Subjects: Zoology
Publisher: New York, Macmillan company London, Macmillian and co., ltd.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library
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THE HYDRA AND J7N ALLIES 211 swim away. The jelly-fishes then give rise to the sexualproducts and discharge them into the water (Fig. 198).In other cases the jelly-fish is formed but never separated
Text Appearing After Image:
FIG. 198. — Bougainvillea ramosa. A, entire colony, natural size; B, portionof the same magnified; C, immature medusa; dr. c, circular canal; cu,cuticle or perisarc; ent. ccw, enteric cavity; hyd, polyp or hydranth; hyp,hypostome or manubrium ; med, medusa; mnb, manubrium ; rad. c, radialcanal; t, tentacle; v, velum. From Parkers Biology, after Allman.This is closely allied to the New England B. super cllians. 212 ZOOLOGY from the parent, and the eggs develop in the bud. Instill other cases a mere bud, called gonophore, is formed,which becomes full of sexual products without ever ac-quiring resemblance to a jelly-fish. The jelly-fish is theprimitive type which has undergone a reduction in somecases to a gonophore. It is an interesting fact that incertain species sometimes jelly-fishes and sometimes gono-phores will be produced. In the Campanularidae the
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